Information reproducer

Abstract

A video signal reproducing system including a still picture reproduction function is provided with correction circuitry for preventing the line jitter problem which often occurs in conventional units. A memory circuit is provided which has a capacity of at least one field, and receives a video input via a variable delay circuit. The output is derived, in alternate fields, from the memory circuit or a correction circuit. In one embodiment, the correction circuit may deliver a line interpolated signal derived by averaging the memory output signal and a 1-H delayed signal from the memory circuit.

What is claimed is: 
     
       1. An information reproducer of the type in which video information recorded on a recording medium is read therefrom and reproduced, comprising; first timing signal generation means for generating a first timing signal corresponding to the time-axis error of a video signal obtained from said recording medium; variable delay means for delaying an input signal by a time determined by a control input; second timing signal generation means for generating a second timing signal for causing said variable delay means to act as a fixed delay line; memory means for storing an output from said variable delay means in accordance with a command signal and capable of storing an amount of data corresponding to at least one field; first signal selection means for selectively supplying one of a signal read from said memory and said video signal read from said recording medium to said variable delay means; second signal selection means for selectively supplying one of said first and second timing signals as said control input to said variable delay means in accordance with said command signal and correction means for processing said signal read from said memory, using the output from said variable delay means, in response to said command signal, so as to improve the quality of a picture reproduced from said signal read from said memory. 
     
     
       2. An information reproducer according to claim 1, wherein said correction means includes means for performing line interpolation at the time of the reproduction of a still picture. 
     
     
       3. An information reproducer according to claim 2, wherein said correction means comprises adder means for combining the outputs of said first signal selection means and said variable delay means; and multiplier means for halving the output of said adder means. 
     
     
       4. An information reproducer according to claim 3, further comprising a third signal selection means having an output coupled to a video output terminal, a first input coupled to an output of said memory, and a second input coupled to an output of said multiplier means. 
     
     
       5. An information reproducer according to claim 1, wherein said correction means includes means for performing luminance-chrominance separation and recombination at the time of the reproduction of a still picture. 
     
     
       6. An information reproducer according to claim 5, wherein said correction means comprises adder means for combining the outputs of said first signal selection means and said variable delay means; subtractor means for differencing said outputs of said first signal selection means and said variable delay means, noise reduction means coupled to an output of said adder means, and second adder means for combining the outputs of said subtractor means and said noise reduction means. 
     
     
       7. An information reproducer according to claim 6, further comprising a third signal selection means having an output coupled to a video output terminal, a first input coupled to an output of said memory, and a second input coupled to an output of said adder means. 
     
     
       8. An information reproducer according to claim 7, further comprising a third signal selection means having an output coupled to a video output terminal, a first input coupled to an output of said memory, and a second input coupled to an output of said correction means, further including changeover control means for switching said third signal selection means at intervals corresponding to a field period. 
     
     
       9. An information reproducer according to claim 1, further comprising a third signal selection means having an output coupled to a video output terminal, a first input coupled to an output of said memory, and a second input coupled to an output of said correction means. 
     
     
       10. An information reproducer according to claim 9, further comprising a third signal selection means having an output coupled to a video output terminal, a first input coupled to an output of said memory, and a second input coupled to an output of said correction means, further including changeover control means for switching said third signal selection means at intervals corresponding to a field period. 
     
     
       11. An information reproducer according to claim 1, wherein the delay time of said variable delay means is fixed at one horizontal line delay in response to said second timing signal.